class_docstr: Class for the ProductHPDMatricesAndSiegelDisks manifold.
  
  The HPD and Siegel product manifold is a direct product of the HPD manifold
  and (n-1) Siegel disks. Each manifold of the product is a square matrix
  manifold of the same dimension.
  
  Parameters
  ----------
  n_manifolds : int
      Number of manifolds of the product.
  n : int
      Size of the matrices.
docstr: Metric to equip the space with if equip is True.
docstr_tok: ["Metric","to","equip","the","space","with","if","equip","is","True","."]
code: def default_metric():
      """Metric to equip the space with if equip is True."""
      return ProductHPDMatricesAndSiegelDisksMetric
  
file_path: geomstats/geomstats/geometry/product_hpd_and_siegel_disks.py
imports: from geomstats.geometry.hpd_matrices import HPDAffineMetric, HPDMatrices
  from geomstats.geometry.product_manifold import ProductManifold, ProductRiemannianMetric
  from geomstats.geometry.scalar_product_metric import ScalarProductMetric
  from geomstats.geometry.siegel import Siegel, SiegelMetric
label_desc: Use image node_id 2 for calling the ProductHPDMatricesAndSiegelDisks obj's underlying member method code with example usage: obj.default_metric() and returns: ProductHPDMatricesAndSiegelDisksMetric